Mitsubishi FX3U User Manual page 5

3. WIRING PRECAUTIONS
• Make sure to cut off all phases of the power supply externally before attempting wiring work.
Failure to do so may cause electric shock or damage to the product.
• Connect the DC power supply wiring to the dedicated terminal described in this manual.
If an AC power supply is connected to a DC input/output terminal or DC power supply terminal, the PLC will burn
out.
• Perform class D grounding (grounding resistance: 100
with a wire as thick as possible.
Do not use common grounding with heavy electrical systems.
• Make sure to attach the top cover, offered as an accessory, before turning on the power or initiating operation after
installation or wiring work.
Failure to do so may cause electric shock.
• When drilling screw holes or wiring, make sure that cutting and wiring debris do not enter the ventilation slits.
Failure to do so may cause fire, equipment failures or malfunctions.
• For the CC-Link system, use CC-Link dedicated cables.
The performance of the CC-Link system cannot be guaranteed with any cable other than CC-Link dedicated cables.
For the maximum total extension length and the cable length between stations, observe the specification described
in the Section 2.5.
With wiring outside the specification range, normal data transfer cannot be guaranteed.
• Do not bundle the CC-Link dedicated cable together with or lay it close to the main circuit, high-voltage line, or load
line. As a guideline, lay the control line at least 100mm (3.94") or more away from the main circuit, high-voltage line,
or load line.
Otherwise, noise disturbance and/or surge induction are likely to take place.
• Make sure to fix communication cables and power cables connected to the module by placing them in the duct or
clamping them.
Cables not placed in duct or not clamped may hang or shift, allowing them to be accidentally pulled, which may
result in malfunction or damage to the module and the cables.
• When disconnecting a communication/power cable connected to the module, do not hold the cable area.
For a cable connected to a terminal block, loosen screws of the terminal block, then disconnect the cable.
If a cable is pulled while it is connected to a module, the module may malfunction or the module and the cable may
be damaged.
• Make sure to properly wire the extension equipment in accordance with the following precautions.
Failure to do so may cause electric shock, equipment failures, a short-circuit, wire breakage, malfunctions, or
damage to the product.
- The disposal size of the cable end should follow the dimensions described in the manual.
- Tightening torque should follow the specifications in the manual.
Safety Precautions
(Read these precautions before use.)
or less) to the grounding terminal on the FX
(3)
Reference
35
Reference
-16CCL-M
3U
35